Webster's English Dictionary

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umbrella

1. um.brel.la \.*m-'brel-*, esp South '*m-.\ n [It ombrella, modif. of L 
   umbella, dim. of umbra] 1: a small circular canopy with hinged ribs 
   radiating from a center pole fo r protection against weather 2: the 
   bell-shaped or saucer-shaped largely gelatinous structure that forms  the 
   chief part of the body of most jellyfishes 3a: a defensive formation of 
   planes maintained over surface operations or a  landmass 3b: a heavy 
   barrage 
2. umbrella aj : taking in many individuals or groups : all-embracing 
3. umbrella vt : to protect, cover, or provide with an umbrella